A patient is secured to a subject support (10). A stereotaxic wand (40) is inserted into a tool guide (60). The wand has a tip portion (44), a portion extending along a pointing axis (46) of the wand, an offset portion (42) which is offset from the pointing axis of the wand, and at least...http://www.google.es/patents/US5732703?utm_source=gb-gplus-sharePatente US5732703 - Stereotaxy wand and tool guide
